Most of the IRLP systems running run in half-duplex mode. This is because they are either running on a simplex frequency or accessing a repeater through a half duplex radio. Some systems are capable of running full-duplex, but there are a few software and hardware limitations which do not allow the system to run full duplex in its current configuration.
Speak Freely has the ability to run full-duplex, and the IRLP interface board was designed with full duplex operation in mind. Several of the IRLP users have requested that I look further into full duplex linking in the near future.
So as a warning to anybody who may be considering moving to full duplex in the future, PLEASE note you will REQUIRE the following: